If u r overweight, then such type of pain at such an early age is possible. Need to lose ur weight. Regular warm up exercises of all the joints are also necessary.
If u r working in AC, condition may be even severe. Try to cover urself with warm clothing like jeans pant and sweat shirts when in AC.
Next Steps
add sufficient quantity of milk in diet.
Health Tips
try to get some good therapeutic massage and steam bath from a trained medical therapist. consult doctor for the same. if things doesn't help, then we will have to think of other possibilities